Re: [PATCH] Direct IO async short read bug followup
On Fri, 2005-04-01 at 17:27, Andrew Morton wrote: > Andrew Morton <[EMAIL PROTECTED]> wrote: > > > > > --- linux-2.6.11.orig/fs/direct-io.c2005-04-01 15:33:11.0 > > -0800 > > > +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 > > > @@ -66,6 +66,7 @@ struct dio { > > > struct bio *bio;/* bio under assembly */ > > > struct inode *inode; > > > int rw; > > > + ssize_t i_size; /* i_size when submitted */ > > > > I'll change this to loff_t, OK? > > And I think local variable `transferred' can remain ssize_t. Agree? Yes. Daniel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
On Fri, 2005-04-01 at 17:20, Andrew Morton wrote: > Daniel McNeil <[EMAIL PROTECTED]> wrote: > > > > I updated the patch to add an i_size element to the dio structure and > > sample i_size during i/o submission. When i/o completes the result can > > be truncated to match the file size without using i_size_read(), thus > > the aio result now matches the number of bytes read to the end of file. > > > > Can you provide the analysis of the bug, please? The direct i/o code is mapping the read request to the file system block. If the file size was not on a block boundary, the result would show the the read reading past EOF. This was only happening for the AIO case. The non-AIO case truncates the result to match file size (in direct_io_worker). This patch does the same thing for the AIO case, it truncates the result to match the file size if the read reads past EOF. > > > > > Daniel > > > > --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 > > -0800 > > +++ linux-2.6.11/fs/direct-io.c2005-03-31 16:59:15.0 -0800 > > @@ -66,6 +66,7 @@ struct dio { > > struct bio *bio;/* bio under assembly */ > > struct inode *inode; > > int rw; > > + ssize_t i_size; /* i_size when submitted */ > > I'll change this to loff_t, OK? > - Yes. Daniel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
Andrew Morton <[EMAIL PROTECTED]> wrote: > > > --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 > -0800 > > +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 > > @@ -66,6 +66,7 @@ struct dio { > >struct bio *bio;/* bio under assembly */ > >struct inode *inode; > >int rw; > > + ssize_t i_size; /* i_size when submitted */ > > I'll change this to loff_t, OK? And I think local variable `transferred' can remain ssize_t. Agree? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
Daniel McNeil <[EMAIL PROTECTED]> wrote: > > I updated the patch to add an i_size element to the dio structure and > sample i_size during i/o submission. When i/o completes the result can > be truncated to match the file size without using i_size_read(), thus > the aio result now matches the number of bytes read to the end of file. > Can you provide the analysis of the bug, please? > > Daniel > > --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 -0800 > +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 > @@ -66,6 +66,7 @@ struct dio { > struct bio *bio;/* bio under assembly */ > struct inode *inode; > int rw; > +ssize_t i_size; /* i_size when submitted */ I'll change this to loff_t, OK? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
Daniel McNeil [EMAIL PROTECTED] wrote: I updated the patch to add an i_size element to the dio structure and sample i_size during i/o submission. When i/o completes the result can be truncated to match the file size without using i_size_read(), thus the aio result now matches the number of bytes read to the end of file. Can you provide the analysis of the bug, please? Daniel --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 -0800 +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 @@ -66,6 +66,7 @@ struct dio { struct bio *bio;/* bio under assembly */ struct inode *inode; int rw; +ssize_t i_size; /* i_size when submitted */ I'll change this to loff_t, OK? - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
Andrew Morton [EMAIL PROTECTED] wrote: --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 -0800 +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 @@ -66,6 +66,7 @@ struct dio { struct bio *bio;/* bio under assembly */ struct inode *inode; int rw; + ssize_t i_size; /* i_size when submitted */ I'll change this to loff_t, OK? And I think local variable `transferred' can remain ssize_t. Agree? - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
On Fri, 2005-04-01 at 17:20, Andrew Morton wrote: Daniel McNeil [EMAIL PROTECTED] wrote: I updated the patch to add an i_size element to the dio structure and sample i_size during i/o submission. When i/o completes the result can be truncated to match the file size without using i_size_read(), thus the aio result now matches the number of bytes read to the end of file. Can you provide the analysis of the bug, please? The direct i/o code is mapping the read request to the file system block. If the file size was not on a block boundary, the result would show the the read reading past EOF. This was only happening for the AIO case. The non-AIO case truncates the result to match file size (in direct_io_worker). This patch does the same thing for the AIO case, it truncates the result to match the file size if the read reads past EOF. Daniel --- linux-2.6.11.orig/fs/direct-io.c 2005-04-01 15:33:11.0 -0800 +++ linux-2.6.11/fs/direct-io.c2005-03-31 16:59:15.0 -0800 @@ -66,6 +66,7 @@ struct dio { struct bio *bio;/* bio under assembly */ struct inode *inode; int rw; + ssize_t i_size; /* i_size when submitted */ I'll change this to loff_t, OK? - Yes. Daniel - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Direct IO async short read bug followup
On Fri, 2005-04-01 at 17:27, Andrew Morton wrote: Andrew Morton [EMAIL PROTECTED] wrote: --- linux-2.6.11.orig/fs/direct-io.c2005-04-01 15:33:11.0 -0800 +++ linux-2.6.11/fs/direct-io.c 2005-03-31 16:59:15.0 -0800 @@ -66,6 +66,7 @@ struct dio { struct bio *bio;/* bio under assembly */ struct inode *inode; int rw; + ssize_t i_size; /* i_size when submitted */ I'll change this to loff_t, OK? And I think local variable `transferred' can remain ssize_t. Agree? Yes. Daniel - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/